diff --git a/emulators/minivmac37.yml b/emulators/minivmac37.yml
index abccd36f..089bf95f 100644
--- a/emulators/minivmac37.yml
+++ b/emulators/minivmac37.yml
@@ -7,7 +7,8 @@ source_commit: "6860a9a7f372c461b25dc42974b191a453ebcfb2"
 core_version: "37.03"
 display_name: "Apple - Macintosh Plus (Mini vMac 37)"
 mode: standalone
-cores: []
+cores: ["minivmac"]
+built_by: [retropie]
 systems:
   - apple-macintosh
 
diff --git a/emulators/px68k-sdl.yml b/emulators/px68k-sdl.yml
index 21e61cc8..c62825df 100644
--- a/emulators/px68k-sdl.yml
+++ b/emulators/px68k-sdl.yml
@@ -7,7 +7,8 @@ source_commit: "e29ce400a030aea29b447757eeb28fef7a0c493e"
 core_version: "0.15+K"
 display_name: "Sharp - X68000 (px68k SDL)"
 mode: standalone
-cores: []
+cores: ["px68k"]
+built_by: [retropie]
 systems:
   - sharp-x68000
 
diff --git a/emulators/quasi88kai.yml b/emulators/quasi88kai.yml
index 2f6fa558..714e2277 100644
--- a/emulators/quasi88kai.yml
+++ b/emulators/quasi88kai.yml
@@ -7,7 +7,8 @@ source_commit: "0d4e171415cad7ac19ae4ff0dcf8cdcfd825947b"
 core_version: "0.7.1"
 display_name: "NEC - PC-8800 series (QUASI88kai)"
 mode: standalone
-cores: []
+cores: ["quasi88"]
+built_by: [retropie]
 systems:
   - nec-pc-88
   - nec-pc-80